Just my two cents. I was diagnosed at 9, and on medication for a few years (some kind of patch on my arm). I then was off meds from like 13 to 27. I got back on meds last year, and it has been life-changing, quite literally.

Sure, I was "functional" without them. I could hold down a job, have good relationships, remember to exercise, whatever.

But everything is so, so much easier with medication than without. I'm on a low dose of Adderall and fluoxetine (for gad), nothing crazy. Social interaction is much better than before, and I'm much happier, and massively more productive.